Retrofit
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Retrofitting refers to the addition of new technology or features to older systems. An example of this is car customizing, where older vehicles are fitted with new technologies; power windows, cruise control, remote keyless systems, electric fuel pumps, etc. Particularly popular amongst auto enthusiasts is the process of correctly retrofitting OEM HID projectors into their outdated factory or aftermarket headlamps. The whole system is purchased off of such auction websites, where through careful assembly, the head lamps are opened and worked on. Retrofitting may also refer to the process of strengthening older buildings in order to make them earthquake resistant (See also Seismic retrofit).